Planing-machine for blower-pistons



(No Model.) 2 Sheets-Sheet l.

B. D. JOHNSTON. PLANING MACHINE FOR BLOWER PISTONS.

No. 509,086. Patented Nov.- 21,1893.

MWitnesses: I v Inveptor a W'EZEEOIDGY (No Model.) 2 Sheets-Sheet 2.

E. D. JOHNSTON. PLANING MACHINE FOR BLOWER PISTONS.

No. 509,086. Patented Nov. 21, 1893.

' Witnesses:

. I I ,1; w WWW or Attorney nnnnnnnnnnnnn c.

UNrrED STATES PATENT OFFICE.

EDGAR D. JOHNSTON, OF CONNERSVILLE, INDIANA.

PLANlNG-MACHINE F OR BLOWER-PISTONS.

SPECIFICATION forming part of Letters Patent No. 509,086, dated November21, 1893.

Application filed March 13, 1893. Serial 110.465.751. (No model.)

.To all whom it may concern:

Be it known that I, EDGAR D. JOHNSTON, of Connersville, Fayettecounty,Indiana, have invented certain new and useful Improve-' ments inPlaning-Machines for Blower-Pistons, of which the following is aspecification. This invention relates to improvements in planingmachines for dressing the curved contacting surfaces of the pistons orrevolvers of rotary blowers, and the improvements will be readilyunderstood from the following description taken in connection with theacpoints thereon between which is comprehended convex and concave curveswhose surfaces are to be accurately planed parallel with the axis of thepiston, such planing however being not absolutely essential at thecentral concave curve;

3, are packing ribs projecting from the peripheries of the piston, inthe line of the major axis of the curves of the piston, the extremitiesof these ribs being dressed to a circle to fit the cylinderof theblower; the peripheral portions of the piston at each side of theseribs, not being necessarily dressed, the entire piston shown in Fig. 3therefore calls for the accurate dressing of four convex curves from thepoints 2 inwardly, and for the dressing of the two packing ribs.

4, Fig. 4, indicates a second form of piston whose periphery is formedby an unbroken curve requiring to be dressed throughout.

5, are points in the curve where the convex end curves join the smallerconvexside curves.

6, are the convex end curves.

7, is the bed of the planing machine. the table thereof.

9, are the housings.

10, is a pair of housings secured to the table ,the path of movement ofthe planer table.

11, is a clamp pin carried by one of the housings 10 and adapted'to beprojected into a proper hole in the end of the blower-piston whereby thepiston, when supported in the housings 10, is held against rotation inthe housings 10 and in an accurate position.

12, is a rail secured against theupper portion of the.housings 9 of theplaner. 13, is a saddle fitted to slide along this rail. 14, is a toolslide fitted to slide vertically in a dovetail in this saddle.

15, is a counterbalancing Weight connected with the tool slide andadapted to draw it upward in the saddle.

16, is a templet rigidly secured to the lower edge of the rail andhaving its lower edge formed into a curve corresponding with the curveto be produced upon the upper surface of the blower-piston, as from 2 to2 in Fig. 3.

17, is a stud projecting rigidly from the lower end of tool slide 14rearwardly under the templet 16 and armed at its rear end with anupwardly presenting knife edge making contact with the curve of thetemplet, the arrangement being obviously such that counter- Weight15tends to hold the slide 14 upward as far as the contact of stud 17 withthe tem-' plet will permit. p i

18, is a downwardly opening notch in the. lower portion of the saddle tothe rear of tool slide 14 to permit of the rise and fall of stud 17 asthat stud follows the curve of the templet.

19, is a tool block fitted to slide vertically in a dove-tail upon thefront of tool slide 14.

20, is an adjusting screw engaging the tool slideand tool block andserving as means by which the tool block 19 may be vertically adjustedupon slide 14.

21, is an apron pivoted in the front of tool block 19 and provided witha tool clamp.

22, is a tool held in the tool clamp of the apron and presenting itscutting point downwardly in the. vertical plane of the axis ofstud l7.

23, is a second saddle upon rail 12, similarly provided with thedescribed accessories.

24, is a second rail rigidly secured against the planer housings 9 belowthe axis of the housings 10 and above the table of the planer.

25, is a saddle, similar to saddle 13, fitted to slide upon this lowerrail and provided with the accessories described in connection withsaddle 13, the parts being however inverted so that the cutting toolpresents its point upwardly. 26, is a counter-weight tending to hold thetool slide of this saddle up, the action of this counter weight,however, being different from that of counterweight .15 in that counterweight tended to pull the cutting tool away from its ork, this tendencyof the weight .being resisted by the weight of the tool slide and partscarried by it, while in case of counter-weight 26 the counterweighttends to urge the tool into the work, the action of the counter-weightbeing resisted by the gravity of the tool slide and its attached parts.

27, is a spring tail projecting downwardly from the apron which carriesthe tool of saddle 25, the office of this spring tail being to urge theapron into normal working position and still permit it to swing forwardfor the relief of the tool upon the backing stroke of the planer.

28, is a templet rigidly secured to the upper surface of rail 24 andhaving its upper edge in the form of a guiding curve similar to that oftemplet 16.

29, is a second saddle upon the rail 24, similar in construction andaccessories to saddle 25.

30, is a fifth saddle arranged for vertical sliding motion upon one ofthe housings 9 of the planer. 31, is a tool slide sliding horizontallyin this saddle. 32, is a tool block sliding horizontally on this toolslide and controlled in its position upon the tool slide by a screw asin the case of the other saddles. 33, is the cutting tool pertaining tothis sad.- dle and carried in an apron pivoted in tool block 32.

34, is a rack upon tool slide 31 and engaged bya pinion journal in aportion of saddle 30. 35, is a sheave upon the shaft of this pinion.

36, is a counter-weight suspended by a chain winding upon sheave 35.

37, is a templet rigidly secured to the outer surface of the planerhousing on which saddle 30 slides, this templet presenting a guidingcurve outwardly.

38, is a knife edge stud projecting rearwardly from tool slide 31 andengaging the guiding edge of templet 37, the templet thereforecontrolling the position of the tool slide and parts carried by it, andthe counterweight 36 tending to urge the tool slide inwardly and holdthe knife edge in contact with the templet; and 39, is a saddle upon theopposite housing of the planer, similar in construction and provisionsto the saddle 30.

No illustration or description is given of the-means for traversingthesaddles upon the rails, &c., on which they move, as such means will bethe same as is usual with planing machines, as will also be the meansfor giving reciprocating motion to the table of the machine. The blowerpiston having been secured in the housings 10, and the cutting toolsproperly set, the cutting tools will reproduce upon the piston thecurvesdefinedby the templets. For blower pistons of the form indicated in Fig.4., the four templets would be employed, but for pistons of the formindicated in Fig, 3, the templet 37 may be omitted as the onlyrequirementis that the tools at the side shall dress a narrow rib, andthe face of the tool may be relied upon to give the proper form to thesenarrow ribs.

I claim as my invention 1. The combination, substantially as set forth,with a planer bed, planer table, and planer housings, of a pair of shafthousings projecting upwardly from the table and adapted to support ablower-piston by its axial shaft, a rail secured to the planer housingsabove the axis of the shaft housings, a rail secured to the planerhousings below the axis of the shaft housings, one or more saddlesfitted to slide upon each of said rails, tool slides and accessoriescarried by said saddles, templets mounted upon said rails, and studscarried by said tool slides and engaging the templets of theirrespective rails.

2. The combination, substantially as set forth, with a planer bed,planer table, and planer housings, of a pair of shaft housingsprojecting upwardly from the table and adapted to support ablower-piston by its axial shaft, a rail secured to the planer housingsabove the axis of the shaft housings, a rail secured to the planerhousings below the axis of the shaft housings, one or more saddlesfitted to slide upon each of said rails, tool slides and accessoriescarried by said saddles, templets mounted upon said rails, studs carriedby said tool slides and engaging the templets of their respective rails,saddles arranged to slide upon the planer housings, templets secured tothe planer housings, and tool slides and accessories at the saddles ofthe housings and having studs engaging the ternplets on the housings.

3. The combination, substantially as set forth, with a planer bed,planer table, and planer housings, of shaft housing projecting upwardlyfrom the plan er table and adapted to support a blower piston by itsaxial shaft, a'rail secured to the planer housings, a ternplet securedto-said rail and presenting a curved edge toward the axis of said shafthousings, a pair of saddles fitted to slide upon said rail, a tool slidein each of said saddles, tool carrying accessories upon said toolslides, and studs projectingfrom said tool slides into engagementwithsaid templet.

EDGAR- D. JOHNSTON.

Witnesses:

ED. HARMAN, REUBEN Column.

